Diagnosis Bathycrinidae with cup conical to funnel shaped, or with median constriction. Basals may be fused, absent or possibly small and covered by the radials in Naumachocrinus. Every second or third brachial articulation ligamentary (cryptosynarthrial). Proximal columnals low and discoidal in adults. Elongate columnals in mesistele, with exception of Cingocrinus. Fixation by radicular cirri, in Naumachocrinus by terminal disk. [details]